Calculating machint



J. C. WAHL.

CALCULATING MACHINfi.

APPLICATION FILED SEPT-25.19;- 1531 1,729'. Patented 29, 1919.

2 SH -SHEET I.

J. C. WAHL. CALCULATING MACHINE. APPLICATION FILED SEPT. 25. 1916.

2 SHEETSSHEET 2.

UNITED STATES r a rnnr OFFICE.

JOHN C. WA'HL, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE 'WAHL COMPANY, OF WILMINGTON, DELAWARE. A CORPORATION OF DELAWARE.

CALCULATING-MACHINE.

Specification of Letters Patent. Patented July 29, 1919.

' Application filed September 25, 1916. Serial No. 122,000. I

To all whom it may concern: My invention may then be best understood Be it known that I, J OHN C. VVAHL, acitiby reference to the accompanying drawings zen of the United States, residing at 0111- of hich: cago, in the county of Cook and State of Figure 1 is a side elevation of a \Vahl Illinois, have invented a certain newv and totalizer equipped with my invention, said uset'ul Improvement in Calculating-Matotalizer having one of the side plates rechines'.' of which the following is a specifimoved. Y 4 cation. I Fig. 2 is a plan view of the number wheels lily invention relates to calculating maof the totalizer as viewedfroniabove the chines and particularly those of the type section lines 22 of Fig. 1.

described in my Patent- :#:893719 dated Fig. 3 is a perspective view of some of July 21st, 1908, for combined typewriting the parts peculiar to my herein described and computing machine. In the machines invention. described in said patent, there is present an Referring particularly to Fig. 1 those actuating mechanism operated by a set of skilled in the art will recognize the familiar numeral keys and which serves to enter the appearance of the totalizer described in my numbers set up on said keys in a totalizer. cited patent. This totalizer'is mounted on This actuator is provided with a gearshift a truck 10 which is connected to'the car- 9 to control the direction of motion of a masriage of the typewriter (not shown)! The ter wheel serving to enter the numbers digit truck may be identified with truck 10 in by digit into the totalizer to the end that my cited patent. A master wheel 11 serves numbers set up on the keys may be entered to insert numbers digit by digit into a gang into the totalizer either in addition or subof computing wheels 12 rotatably mounted ractitm. After a series of numbers has in the totalizer, these computing wheels bebeen added, the totalizer is cleared by ing connected by carrying mechanism 13 throwing the machine into subtraction and and 14 and being also connected by a set of printing on the paper the number exhibited idler gears 15 to the number wheels 16 which in the totalizer. This operation will result are rotata'bly mounted on a shaft 17 sup 30 in subtracting the exhibited number from ported between the side plates 31 and of the totalizer which, in case the exhibited the totalizer Rotatably mounted on the number had been correctly copied. will reshaft 17 is a bail shaped shutter 18 which turn the totalizer to zero. extends over then face of the numeral wheels (his of the objects of my invention is to 1d and is adapted to be thrown into register provide the totalizer of the before mentioned wlth a sight opening 19 in the totalizer machine with an iiulicat-ion that the excover 20. hibited total hasbeen completely subtracted. Pivoted on the shutter 18 is a linlt #3 Another object of my invention is to prowhich is pivoted to an arm .31 rigid on a vide a check or safeguard to give the op comb having teeth 2-3., 23. 24. 25 and superator a. signal. other than thegip Jearance of ported on a shalt 2G rotatably mounted in a line of zeros at the r ading ine of the the totalizcr side plates 31 and 32. inch totalizcr. that this subtracting operation has cf thelnumber wheels 16 has rigidly athccn corrim-tly performed. tached thereto a gear 27. which serves to rrnother object of my invention is to protransmit the motion of the idler gears 15 to vide a shutter for the ,totalizcr wheels which the number wheels lfi and said gears '27 are shutter will not be visible as long as any all provided with a short tooth '28 in the number remains in the totalizer, but will plane of the comb teeth 21 (025 inclusive. appear on the totalizcr being returned to The tooth 28 has a portionotthe addcndum I removed but left sufficiently lone to mesh The above and other objects of my invcnwith the intermediate gear 15 and bc ro tion will be apparent to those skilled in the tated thereby. The short teeth 2% is s art and will be hereinafter described and placed in reference to zero on the number claimed. p wheel that when said zero is in line with the sight opening 19, the short tooth will be in a position to engage the cooperating tooth of the comb as-shown in Fig. 3.

A spring 29 is mounted on the frame work of the totalizer and tends to turn the comb so as-to engage with the totalizer gears 27. When the totalizer is in a zero position all of theshort teeth 28 will be in line and the spring 29 will force the comb downward (Fig. 3 until the teeth or said comb rests on the short teeth 28. This by means of the link 33 will elevate the shutter 18 so that it is opposite, the sight opening 19. 'In case the totalizer is not clear-one of the short teeth 28 will not be in line and one of the The face of the shutter may be colored some distinctive color, such for instance, as red or it may have some suitable legend 30 such as Totalizer clear inscribed thereon. Either of these devices being intended to give a distinctive signal to the operator that the totalizer is clear. I

In some cases it may be desirable to ar- Ni range the shutter so that it will cover up 'the totalizer wheels in case a number is in the totalizer and will disappear when the totalizer is clear. Such a change can be readily made by those skilled in .th'eart .0 since it involves only a change in the length of the connecting link 33. The object of arranging the shutter in this way is for the purpose of checking account by the system of writing predetermined totals. In this 5 system one operator writes a sheet from original data and computes it and writes the total thereof. At the same time said total is alsowritten on a tally roll. The second or checking operator then writes a second 0 sheet from the same set of items but does not a see the total of said items on account of the totalizer Wheels being concealed by the position of shutter 18. Instead of copying the total from the totalizer the second operator 5' copies said total from the tally sheet made by the first operator. In case both computations are'correct the shutter will then disappear exhibiting a line of zeros on the to .talizer of'the second operator, If the shut- 1 ter, does not disappear it is evident that an error has been made either by the first operator'or by the second operatorand the two sheetsare then compared. with" the orginal data and this error is found.

i My herein described invention is very .use-

ful in connection with this second method of operation known as the method of checking predetermined totals. It is obvious that both the first and the second operator must; make the identical mistake in order for-this check to fail.' Furthermore, a check of this kind will catch an error which would not be caught by the method of keeping grand totals of the original items since in the grand total method, that is, if an operator were to charge the account of'John Jones with an item that belonged to the account of John Jackson the grand totals of the items charged would be the same and the error would not be caught by the grand total method. However, the method of predetermined totals will catch an error of this' kind since it is necessary that the balance of John Joness account as written by the first operator should be the same as the balance of John Joness account as written by the second operator.

In Figs. 4, 5 and 6 I have shown the modification of my invention in which the shutter is invisible as long as the totalizer is clear,but as soon as a number is put into the totalizer the shutter is displayed at the si ht opening. Reference to said figure will disclose that the shutter 18 and link 33 of Fig. l have been slightly modified, 34 is the shutter which replaces the shutter 18, 35 is a handle attached thereto and the shutter 34 is connected by link 36 to the arm 21 of the comb. When the spring 29 is permitted to act by the alinement of the short teeth 28 opposite the comb, the shutter will be lifted out of its position in front of the sight opening 19. This will correspond to a zero position of the totalizer.

Upon any of the numeral wheels being turned from this zeroposition, a long tooth of one of the gears 27 will engage its cooperating tooth of the. comb and thus lower the shutter in line with the sight opening. The handle 35 which projects through a suitable opening in the cover, is provided for the purpose of lowering the shutter still further by rotating the comb and taking a peep at the number displayed by the totalizer wheels. It is obvious that those skilled in the art will have no difficulty whatever in substituting the modified shutter 34 for the shutter 18 shown in Figs. '1, 2 and 3.

Many changes and modifications may be made in the construction herein disclosed by those skilled in the art'without departing from the spirit of my invention since I cla1m: c

1. In a calculating machine the combination of a zero determining device and a shutter. operated by said zero determining device.

2. In a totalizer the combination of a set of numeral wheels, a zero determining de- 130' vice operatively connected with said nuoperated bysaid zero determining device.

3. In a calculating machine the combination of a set of numeral wheels, a zero determining device and a shutter operated by said zero determining device.

4:. In a calculating machine the combina tion of a set of computing wheels, a zero de-' termining device associated with said computing Wheels anda zero indicating device adapted to be shifted by said zero determining device.

5. In a totalizer the combination of a set of numeral wheels, a comb adapted to contact with said numeral wheels and having a position dependent upon the position of said numeral wheelsand a shutter adapted to be.

operated by said comb.

6. In a calculating machine, the combination of a set of computing wheels, a comb adapted to cooperate with said computing wheels and a shutter operated by said comb.

7. In a calculating machine the combination of a set of computing wheels, a comb for determining the position of said computing wheels and a shutter adapted to be operated by said comb.

8; in a calculating machine the combination of a set of numeral wheels, a cover hava. sight opening therein for the purpose of reading the number exhibited lay said numeral wheels, a zero determining device assoclated with said numeral wheels and a shutter operated by said determining device.

9. In a calculating machine the combinat1on of a set of numeral wheels, acover having a sight opening-therein for the purpose of reading the number exhibited by said 1111- meral wheels, a comb associated with said numeral wheels and a shutter operated by said comb device.

10. In a totalizer the combination of a Set of computing wheels, said wheels having short teeth, zero determining device to check the position of said wheels'and a shutter operated by said determining device.

11. In a calculating machine, thecombination with a series of indicating devices,

means for actuating the same, a signalpommon to said devices, and operating means between said devices and said signal whereby the latter is displayed upon said indicating devices assuming a predetermined relative position, said operating means bein adapted to permit the indicating devices to shift to a new position and coincidently throw the signal to non-indicating position.

In witness whereof I have hereunto subscribed my name in presence of a witness.

JOHN C. WAHL.

Witness ARTHUR F. POOLE. 

